How to create an instal file?

Does anyone have a good reference on how I can create an install file, that based on a form that the client fills out will create a database, setup the default settings, adjust the database with the fields entered by client. Including creating the table and changing all database information to the information supplied by the client? I know a good example is PHPBB2, however I can't seem to disemble their install structure. I'm just looking for a good tutorial or reference or maybe someone can point me to a book that explicitly talks about how to do such a task. Thanks, Tony